docs: def get_content(self, page, language, ctype, language_fallback=False):
          """Gets the latest content string for a particular page, language and
          placeholder.
  
          :param page: the concerned page object.
          :param language: the wanted language.
          :param ctype: the content type.
          :param language_fallback: fallback to another language if ``True``.
          """
          if page is None:
              page = fake_page
  
          if " " in ctype:
              raise ValueError("Ctype cannot contain spaces.")
          if not language:
              language = settings.PAGE_DEFAULT_LANGUAGE
  
          frozen = int(bool(page.freeze_date))
          key = self.PAGE_CONTENT_DICT_KEY % (page.id, ctype, frozen)
  
          # Spaces do not work with memcache
          key = key.replace(' ', '-')
  
          if page._content_dict is None:
              page._content_dict = dict()
          if page._content_dict.get(key, None):
              content_dict = page._content_dict.get(key)
          else:
              content_dict = cache.get(key)
  
          # fill a dict object for each language, that will create
          # P * L queries.
          # L == number of language, P == number of placeholder in the page.
          # Once generated the result is cached.
          if not content_dict:
              content_dict = {}
              for lang in settings.PAGE_LANGUAGES:
                  try:
                      content = self.get_content_object(page, lang[0], ctype)
                      content_dict[lang[0]] = content.body
                  except self.model.DoesNotExist:
                      content_dict[lang[0]] = ''
              page._content_dict[key] = content_dict
              cache.set(key, content_dict)
  
          if language in content_dict and content_dict[language]:
              return content_dict[language]
  
          if language_fallback:
              for lang in settings.PAGE_LANGUAGES:
                  if lang[0] in content_dict and content_dict[lang[0]]:
                      return content_dict[lang[0]]
          return ''